KR200358593Y1 - Coaxial cable - Google Patents

Abstract

A coaxial cable comprising an inner conductor of a silver-plated copper-clad steel wire at a center, a polymer resin insulator intended to surround the inner conductor, and an outer conductor surrounding the insulator, wherein the insulator is made of foamed teflon. .

According to this, it is possible to perform plating to increase the shielding efficiency by using foamed teflon as an insulator, and because it contains an air layer with a small loss of dielectric constant, it has excellent ultra-high frequency characteristics, can lighten the product, and has the same characteristics. Since the outer diameter can be minimized than the product, the miniaturization of equipment becomes possible.

Description

Coaxial cable using foamed teflon

The present invention relates to a coaxial cable made of an inner conductor coaxial with an outer conductor, which is one of transmission lines. More specifically, a foamed teflon made of a foamed teflon resin is used as an insulator surrounding the inner conductor. It relates to the coaxial cable used.

Coaxial cable has a large capacity and is used in long distance telephone networks, mobile communication networks (base stations, repeaters, etc.), wired TVs, and local area information networks (LANs). In particular, LANs have high transmission speeds and large capacities. Coaxial cable can be divided into various types according to the structure, but in general, as shown in Figure 1, the silver-plated copper-coated steel wire (inner conductor) (1) in the center wrapped with a polymer resin insulator (2), such as polyethylene and the net It is wrapped in the outer line 3 of the shape, and then covered with a coating (not shown). In other words, it consists of inner conductor-insulator-outer conductor-shell (jacket) from the center, where the insulator serves to prevent the disturbance of the signal moving to the core wire, and the outer conductor shields the adjacent line. Play a role.

In addition, the coaxial cable is a semi-rigid cable, a semi-flexible cable, a multi-flexible cable, and an RG cable depending on the form of the outer conductor. Semi-rigid cable is a semi-rigid cable, as shown in Figure 2a, the outer conductor is coated with a copper or aluminum tube and the tin plating on it to maintain the shielding, semi Semi-flexible cable is an outer conductor, and after tin-plated copper wire braid 30-1, tin-plated copper wire braid 30-1 was applied to tin-plated copper wire 30-2 (FIG. 2B). , Multi-flexible cable is made of a silver plated copper tape (300-1) and a silver plated copper wire braid (300-2) the outer conductor (Fig. 2c) Finally, the RG cable (not shown) Copper braiding of outer conductor and tin-plated copper braiding After performed once or twice it will be covered by a jacket.

However, in the case of a semi-rigid cable or a semi-flexible cable that performs plating during the manufacturing process, using polyethylene having a low melting point as an insulator has been difficult to apply to a plating process performed at high temperature. For this reason, Teflon series resins are used.

The present invention relates to the insulator of the coaxial cable having excellent electrical properties using a foamed teflon resin.

In view of the above, an object of the present invention is to eliminate the problems of application in the plating process by using polytetratrafluoroethylene in which an insulator configured to surround the core wire is prevented to prevent signal disturbance. To provide a coaxial cable using foamed teflon with electrical characteristics.

1 is a view for explaining the general structure of a coaxial cable,

2A is a view for explaining the structure of a semi-rigid cable,

2B is a view for explaining the structure of a semi-flexible cable,

FIG. 2C is a view for explaining the structure of a multi-flexible cable, FIG.

3A to 3D are graphs for comparing and explaining attenuation amounts of the invention example and the comparative example.

An object of the present invention is a coaxial cable composed of an inner conductor of a core core or silver-plated copper-clad steel wire, a polymer resin insulator intended to surround the inner conductor, and an outer conductor surrounding the insulator, wherein the insulator is made of foamed teflon. It is achieved by providing a coaxial cable characterized in that the configuration. According to this, an insulator consists of foamed Teflon resin, and is excellent in heat resistance and an electrical characteristic value. That is, when using a conventional polystyrene resin as an insulator, it was difficult to implement a plating process to increase the shielding efficiency, but using Teflon as an insulator as in the present invention can be easily carried out plating. In addition, foamed teflon is used, which contains a large amount of air layer that can reduce dielectric constant and dielectric loss, so it has excellent ultra-high frequency characteristics, can lighten the product, and can minimize the outer diameter than products with the same characteristics, so that the equipment can be miniaturized. Become.

In addition, the coaxial cable of the present invention is characterized in that the outer conductor is tin-plated on the first outer conductor and the first outer conductor covering the insulator by using copper or aluminum tube. According to this structure, the insulator is made of foamed Teflon resin, so the electrical characteristics are excellent, and in particular, the shielding efficiency of the outer conductor can be further increased. Tin plating can increase corrosion protection and soldering efficiency.

In addition, the outer conductor of the present invention may be a tin plating on the first outer conductor and the first outer conductor surrounding the insulator by copper wire braiding. The coaxial cable has a merit that the shielding efficiency is lower than that of the above, but the outer conductor is composed of tin-plated copper braid braided to be smoothly bent to manufacture a long size cable.

Furthermore, the outer conductor of the present invention may be a first outer conductor that surrounds the insulator and is made of silver plated copper tape, and a second outer conductor of silver plated copper wire braid that surrounds the first outer conductor. The shielding efficiency of the outer conductor is increased by forming a double shielding network of silver plated copper tape and silver plated copper wire braid. Further, tin plating is performed on the second outer conductor to further increase the shielding efficiency of the outer conductor.

In addition, the outer conductor of the present invention may be one copper braided and silver plated copper braided or two copper braided and silver plated copper braided. The coaxial cable has a feature that can be produced at a relatively low cost.

Hereinafter, an embodiment of the present invention will be described.

(Comparative Examples 1 to 4)

A coaxial cable of the same type as the following table (1 to 4) was produced and the attenuation in each frequency band was measured and shown in the table (5 to 8). The measuring instrument is a network analyzer.

Table 1

Table 2

Table 3

Table 4

Table 5

Table 6

Table 7

Table 8

(Examples 11 to 14)

In the coaxial cable of Comparative Examples 1 to 4, the insulation was measured using foam teflon under the same conditions as in the comparative example, and the results are shown in Table 9. The attenuation measured was graphed and shown in 3d in FIG. 3A.

Table 9

400 MHz 1 GHz 2 GHz 3 GHz 5 GHz 10 GHz Example 11 0.55 0.77 1.03 1.57 2.34 Example 12 0.35 0.61 0.83 1.02 Example 13 0.33 0.47 0.63 0.9 1.39 Example 14 0.27 0.34 0.51 0.68 1.08

Unit: dB / M

As shown above, it can be seen that the attenuation of the coaxial cable to which the foamed Teflon is applied according to the present invention is significantly smaller than that of the comparative example.

The coaxial cable according to the present invention described above can be plated to increase shielding efficiency by using a foamed teflon as an insulator, and contains an air layer having a low loss of dielectric constant, which is excellent in ultra-high frequency characteristics and can reduce the weight of the product. In addition, since the outer diameter can be minimized than the products having the same characteristics, it is possible to miniaturize the equipment.

Claims (6)

In the coaxial cable consisting of an inner conductor of a copper core or silver-plated copper-clad steel wire in the center, a polymer resin insulator to surround the inner conductor and an outer conductor surrounding the insulator, A coaxial cable comprising the insulator made of foamed teflon. The coaxial cable according to claim 1, wherein the outer conductor is formed by tin-plating the first outer conductor and the first outer conductor covering the insulator by using copper or an aluminum tube. The coaxial cable of claim 1, wherein the outer conductor is tin-plated on the first outer conductor and the first outer conductor surrounding the insulator by tin-plated copper braiding. The method of claim 1, wherein the outer conductor wraps the first outer conductor and the second outer conductor of the silver-plated copper wire braid wrapped around the insulator and the silver outer copper conductor and the second outer conductor covering the first outer conductor. Coaxial cable characterized by the above. The coaxial cable of claim 4, wherein tin plating is applied on the second outer conductor. The coaxial cable according to claim 1, wherein the outer conductor is one or two copper braided or tin plated copper braided.